voltage amplification

A

amateur_24

Member

• Jun 3, 2012

• #1

Hi
I have a need for 38v supply due to a uv exposeure box am building. Sadly the largest power brick I have to hand is a 19v @4A laptop charger. Is it possible to amplify the voltage into 38v@1A and how would I do that? Some refences would be much appreciated.

 

Last edited: Jun 3, 2012

ronsimpson

Well-Known Member

Most Helpful Member

• Jun 3, 2012

• #2

Do you have several power supplies to connect in series. If you can get three 12V@1A supplies and stack them up you will have 36V@1A.

 

crutschow

Well-Known Member

Most Helpful Member

• Jun 3, 2012

• #3

You could use two 19V chargers in series to get 38V or you could use a boost switching regulator circuit to increase 19V to 38V.

 

Mosaic

Well-Known Member

• Jun 3, 2012

• #4

Perhaps something along this principole
https://www.ladyada.net/library/diyboostcalc.html

 

A

amateur_24

Member

• Jun 4, 2012

• #5

So according to an online calculator, I need a 3.2 ohm resistor to get 400 mA current. However it's rare to find such a value. Would it mtter if I use 2,7 ohm? Am using lm338 btw

 

Last edited: Jun 4, 2012

ronv

Well-Known Member

Most Helpful Member

• Jun 4, 2012

• #6

If you are going to build on have a look here. Keep in mind you will need a pcb.

https://www.ti.com/ww/en/analog/webench/index.shtml?DCMP=TI_Home_Tracking&HQS=home_tsw_analog

 

ronsimpson

Well-Known Member

Most Helpful Member

• Jun 4, 2012

• #7

**broken link removed**

I hope this link works. If not: https://www.electro-tech-online.com/threads/amateur-radio-voltage-booster-circuitry.127878/

This little board will boost you 19 volts up to 36 volts.